Portable drilling and tapping machine.



A. M. LANE.

PORTABLE DRILUNG AND TAPPING MACHINE;

APPLICATION FILED MAY 20. I9I'5.

Patented FbL1, 1916.

IIIIIIA I LL- Limitar.

ALFRED ir LANE, or sr. Leurs, mssoulnn,

'PORTABLE DRILLING AND TAPI'NG MACHINE.

To all 'whom t may concern.:

;Be it known that l, ALFRED M. LANE, a citizen of the United States, and a resident vof the city of St. Louis and State of Missouri, have invented a new and useful lm provernent in Portable Drilling and Tap-V ping Machines, of which the following is a Alsorotating the latten' specification.

This invention relates to portable power driven tools for-drilling holes in metal or j wood, vand consists inea novel spindle 'construction for such tools whereby a hole can be drilled in sheet metal and tapped with a screw thread in a single operation. The inventlon also comprises automatic means for stopping the rotation. of the-tool spindle or socket upon the completion of the tapping operation, and for reversing the direction of rotation of'the tool spindle to withdraw the tap from the hole.

.Further objects and details of the invention aregivenin connection with the. -iiollowing description of the? machine shown l1n the accompany/lng drawing; and what the invention comprises is more particularly defined in the appended claims.

vThe drawing shows apart side view and of a portable electric drill which embodies the invention. The motor is not shown,`as any suitable portable motor may be utilized for the purposes of the invention.

The drilling` and tapping mechanism shown in the drawing consist of a gear case 11 which may be secured by screws or othery suitable means to the motor yplate 12 or to the frame creasing of the motor.

casing 11, and has gear teeth cut on its end. The armature shaft is operatively connected Ato thedriving shaft 14 lfor the tool spindle' by means of atrain of speed Areducing gearing. The speed reducing gearing consists of an' annular or internally toothed gear 15 which is engagedby the toothed end of the armature-shaft and is driven' thereby. vThis annular ear is secured on a shortshaft 16 which 1s rotatably arrangedin'the ear casing 11 a1ongs1de or' v the .driving sha and adjacent to the end of the armature shaft. A toothed pinion 17 is also secured on the shaft 16 to rotate therewith,and this pinion engasges with a toothedgearlSn the driving aft lll: for

' Specification of Letters Patent.'

The 'motor armature shaft 13 projects intov this tapped, and this dpressure on Vthe tool forces it inwar -gage with a. toothed gear 19 loosely mountratembea nessi, 191e. Application'fued may 2o,1915. serialnaeaaei. y

ed on the inner .end of the tool spindle- 20. The gear l19 has a bevel gear 21 on one face which drives an oppositely arranged bevel gear 22, which is also ,loosely mounted on the tool spindle, through an idler bevel gear 23 which is journaled on a short shaft .24 arranged at right' angles to the axisloi the tool spindle. The bevel gears 21, 22 and 23,' constitute a reversing gear for reversing the direction oi" rotation of the tool spindle,

and they are inclos'ed in a detachable casing or hollow nose piece 25 which' is secured to the end of the casingll by Screws or vother suitable. means. rlhe shaft 2e. is threaded through the side/of the reversing gear casing lor nose piece, and can be screwed in and out to adjust the mesh of the bevelv gears. This shaft 24 is locked in adjusted position by means of a nut 26 which screws o n its outer end.

The tool spindle 20 is rotatably and Slid-I ably mounted in bushings 27, 28 whichl are secured 'in the ends of the gear casing 11 and nose piece 25, respectively. The tool spindle has-a clutch sleeve 29 secured to it. between the oppositely arranged bevel gearsy 21` and 22, and said bevel gears haveclutch teeth 30 on the adjacent faces or ends of .their hubs, which teeth are adapted to be engaged by, the teeth 31 on the ends of the clutch sleeve 29 when the drill spindle is shifted axially either inwardly or outwardly through` .its supporting bushings. lThe outer end of the tool spindle 20 is provided with a socket 32 for the tang end 33 of a tool-chuck 34 which has a suitable clamp socket 35 at its extremity fora drilling and tapping tool 36.

A suitable tool for drllllng and tapplng sheet metal is made by grinding ol the ends i of the lands of a fluted tap of the desired sixze and number of threads to form a .V-

point. l g l An automatic stop rod 3'( A1s clampedA to the end of the nose piece 2,5 by: means of a split clamping ring .38 which is adjustable a ong the cylindrical end 39 of the nose piece.

startin v.the motor, the end of the tool is against the piece to-be drilled. ad spm e y and throws the Iclutch In the operation of the machine, 'after ss j l sleeve into clutchingV engagement with the inner bevel gear 21, thereby causing the tool 'spindle to rotate in the same direction" as said inner bevel gear. After the drill point pierces the metal the tap portion of the tool screws into the hole, and both the drill spindle and the casing of thejportable drilling machine ap roachthe metalbeing drilled until the stop 3g strikes the metal andarrests any further approach movement of the cas-.I ing. The tool and' spindle continue to approach the metal, and thus the tool spindle is caused to move outwardly through its supporting bushings inthe nose piece and Further outward withdrawal of the tooly spindle will movetheclutch sleeve into engagement with the outer bevel gear 22 and thereby reverse the direction of rotation vof the tool spindle and cause the .tap to back out ofthe hole.

The parts of the speed reducing and reversing mechanism are small and compactly arranged making the machine light andeasy to handle in confined space; a triple reduction in velocity between the armature shaft and the tool spindle is obtained without undue complication; the stopping of the tool. is positively brought about by automatic means; and the reversing of the tool -spindle is accomplished by merely fpullingvthe machine away from the work. v

It isevident that modication may be' made in the construction and arrangement of the parts of the machine described above, and the invention is not restricted to the precise Idetails of construction shown in the drawings. Also it is evident that the maf chine may be used solelyas a drilling machine or solely l claim 'the'following as my invention:

l. A portable drillin and tapping tool comprising a gear box av apted to be secured to the casing of a portable I n )tor,,saidwgeanr as a tapping machine as circumstances require.

day of May, 1915.

box containing speed reducing gearing adapted to be driven from the armature shaft of said motor, "a nose-piece secured to said gearbox on the side away from said motor casing, a rotary spindle rotatably and slid- Vably mounted in bearings in said gear box i gear arranged on said spindle V:facing said iirst bevel gear and driven therefrom by means of Va-bevel gear meshing with said gears a'nd arranged on 'a stud mounted in said nose-piece at right angles to said spindle, an antifriction thrust bearing arranged on the inner end of said spindle. between said inner bevel gear and said gear box bearing, and a clutch member Iixed onl said spindle between said bevel gears and adapted to bear against said inner bevel gear to transmit endwise pressure oiisaid spindle through said gear and thrust bearing to said gear box.

2. A portable drilling and tapping tool comprising a gear box adapted to be secured -to the casing of a portable' motor, said gear boxsurrounding the end of the armature shaft of said motor, a nose-piece secured to said gearbox and forming an extension of one side thereof, a rotary spindle rotatably and slidably mounted in bearings in said gear box and'nose-piece, a bevel gearloosely mounted on said spindlelnear its inner end.V

and having straight teeth on its outer edge meshing with a spur gear mounted on an axis parallel to said spindle and driven from said armature shaft, a second bevel gear arranged on-said spindle facing said first bevel' gearv and driven therefrom by' means of a bevel gear meshing with said gears and arranged on a stud mounted in said nose-piece at right angles to said spindle, an antifriction thrust bearing arranged onA the inner end of said spindle between said inner bevel gear and said gear box bearing, and a clutch member fixed on said spindle betweensaid bevel gears and adapted to bear against said inner bevelgear to transmit `endwise pressure on said spindle through said gear and thrust bearing to said gear box, whereby the proper mesh of said straight toothed gear ias and spur gear is not disarranged by wear or v distortion of said thrust bearing.

Signed at St. Louis, Missouri, this 17th atraen M. Lann, 

